十万个为什么·科学启蒙30篇（3）

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地球轴指向一颗星，所以北极星几乎不动

Earth spins like a top, and its axis points steadily toward a spot near Polaris.
That means Polaris stays almost fixed while other stars seem to circle around it.
From the North Pole, it appears directly overhead; from the equator, it sits on the horizon.
Its position changes only very slowly over centuries due to wobble in Earth’s spin.
Other stars rise and set each night because Earth rotates under them constantly.
But Polaris stays put since it lines up with our planet’s turning center.
You can use it to find north when hiking or sailing at night.
Ancient sailors and explorers relied on it before GPS or compasses existed.
If you watch the sky for an hour, you’ll see stars swirling but Polaris staying still.
It’s not the brightest star, but it’s the most useful one for finding direction.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Ancient sailors and explorers relied on it before GPS or compasses existed. 在GPS和指南针出现之前，古代航海家和探险者一直依赖它导航。
Other stars rise and set each night because Earth rotates under them constantly. 其他恒星每晚东升西落，是因为地球持续自转，从它们下方经过。
But Polaris stays put since it lines up with our planet’s turning center. 但北极星保持不动，因为它恰好位于地球自转轴的延长线上。

这篇中文题目最接近哪一句？地球轴指向一颗星，所以北极星几乎不动一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？地球像陀螺一样自转，其地轴始终指向北极星附近。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Earth’s Axis Points Toward One Star How to cook noodles A maths worksheet

Ancient sailors and explorers relied on it before GPS or compasses existed.

Ancient sailors and explorers relied on it before GPS or compasses existed.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Ancient sailors and explorers relied on it before GPS or compasses existed.